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# Q.12 Cost of a dozen pens is Rs 180 and cost of 8 ball pens is Rs 56. Find the ratio of the cost of a pen to the cost of a ball pen.

Cost of a dozen pens = Rs 180
Cost of 1 pen = $$\frac{180}{12} = Rs 15$$
Cost of 8 ball pens = Rs 56
Cost of 1 ball pen = $$\frac{56}{8} = Rs 7$$
Hence, required ratio is = 15 : 7